Connected Wirelessly via PPPoE... Yet No Internet

I need pointers on what to do next:
I use my imac (g3-17in) w/AEx card to access a wireless internet service (no cable modem, no DSL, nothin but RF from the top of a tower somewhere around me) in my house.
on iStumbler, the network signal is at least as good as my local AEBase Station. When I created a Location for the wireless connection using PPPoE and use it, my Airport Card finds the wireless host, negotiates, and connects, and Internet Connection window clicks off the minutes I am connected. Yet, when I try to use the web, it says I am not connected to the internet.
I've used the Network Preferences Diagnostics and it ultimately says it can't help me. I've looked at Network Utility and it shows a "good" IP for my imac, and one for the remote host i'm connected to. Last night I plugged the IP for the wireless host in as the URL and got a web page for the server-provider-advertisement. This page had links to other places on the web, but they would not go anywhere either.
Today I sent an inquiry to my wireless ISP asking similar questions -- they aren't all that timely.
The bothersome point is that I had this same link up this summer and it worked great!
As I said in another post, I think I upgraded a bunch of software and then things went sour....but i can't figure what to downgrade now.
My dial up via imacAirportExCard --> AEBaseStation --> telephone to ISP works fine...
I'm running macosx 10.4.2
have an airport extreme card in my imac
768MB ram in the imac
oh yes, i've read posts and posts in this forum from others who have 'similar'problems -- but i've not come across one with quite the same problem as mine....yet
don't know what else to say.
Help?
Thanks

All
I think i have resolved this problem.
After watching a number of log files during the wireless connection phase, I figured that one problem was my end of the link didn't have a DNS address to use...so it couldn't find anything beyond the server node. (i fixed that in the network prefs location setting by looking back at logs from the summer when the link actually worked)
Secondly, the apparent problem with the pppoe link seems to stem from a conflict between my air port extreme base station and the air port extreme card accessing the wireless internet connection. (don't really have any idea what the conflict is but ...)
After unplugging my base station to relocate it to a more convienient spot where I might be able to unplug it as required, i stopped by my machine and hit the "connect" button for the wirelss link....while watching the ppp log window. the link was up and authenticated in a second!
i had just upgraded my machine to 10.4.3 and thought that might have something to do with it...but when i tried the same thing from my ibook running 10.4.2 it worked fine... also the laptop allows me to "DF" the signal better by moving the laptop around for best signal reception.
So i'm considering this a done deal.
Hope this experiment helps someone else.

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LOL!!
I am in Australia and the ISP... I think both the main ones would fit your description to a T.. big T in particular.
Your router is really unsuitable.. if it is only wireless and no ethernet.. just buy an ethernet one.
Do a search on ebay.. 3g router.
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Connected Wirelessly via PPPoE... Yet No Internet

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